Mercury-Free Solid State Deep UV Light Sources for Disinfection and Analysis
Clean Technology 2008

Mercury-Free Solid State Deep UV Light Sources for Disinfection and Analysis

M. Shatalov, Y. Bilenko, O. Bilenko, A. Lunev, I. Shturm, M. Shur and R. Gaska
Sensor Electronic Technology, Inc., US

ultraviolet, ligh-emitting diode, water, disinfection

Ultraviolet (UV) disinfection is an attractive alternative to traditional chemical processes, which require temperature and pH control and often create substantial amounts of disinfection by-products. Currently, low- and medium-pressure mercury vapor lamps are the only UV light sources used for water disinfection in municipal facilities and smaller scale industrial and residential air and water purification systems. Deep UV (DUV) semiconductor light emitting diodes (LEDs) represent new class of UV light sources that are environmentally safe, easily reconfigurable, compact, robust, and inexpensive. Sensor Electronic Technology, Inc. has developed DUV LEDs and multiple chip LED lamps based on various hermetically sealed packaging platforms. UV LED lamps emitting at 280-285nm exhibit CW optical power over 50mW with dissipated power around 10W and a footprint of about 1x1 inch. These mercury-free devices can be directly powered by low-voltage sources such as batteries or solar panels. Moreover, the spectral power distribution of multiple chip LED lamps can be controlled by appropriate electronics, enabling new applications in water, air and food disinfection as well as in biomedical diagnostics. In this presentation we will review current status of DUV LED-based light sources and discuss results of experiments carried out using prototype UV LED disinfection and bioanalytical setups.